CAN COMMUNICATION SYSTEM Open in CAN Main Bus Line

DTC Code DTC Name
Open in CAN Main Bus Line

DESCRIPTION

There may be an open circuit in one of the V bus main lines and/or a DLC3 branch line when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 70 Ω or higher.

Symptom

Trouble Area

Resistance between terminals 6 (CANH) and 14 (CANL) of DLC3 is 70 Ω or higher.

  • DLC3 branch line or connector

  • CAN main bus line or connector

  • ECM

  • Combination meter assembly

  • No. 1 CAN junction connector

This malfunction is not related to the lines of a CAN main bus branch or to ECUs or sensors connected to a CAN main bus branch.

WIRING DIAGRAM

C395557E01

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

Note:

  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

    Click here

  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

    DTC check procedure: Turn the ignition switch to ON and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

  • After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed.

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Tip:

  • Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE

  1. CHECK FOR OPEN IN CAN BUS LINES (DLC3 BRANCH LINE)

    1. Disconnect the cable from the negative (-) battery terminal.

    2. C151827C65

      *1

      DLC3

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E8-6 (CANH) - E8-14 (CANL)

      Cable disconnected from negative (-) battery terminal

      108 to 132 Ω
      Note:

      When the measured value is 133 Ω or higher and a CAN communication system DTC is output, there may be a fault besides disconnection of the DLC3 branch line. For that reason, troubleshooting should be performed again from How to Proceed with Troubleshooting after repairing the trouble area.

      Click here

    Result

    Result

    OK

    NG
    NG

    REPAIR OR REPLACE CAN BRANCH LINE CONNECTED TO DLC3

    OK

  2. CHECK FOR OPEN IN CAN BUS LINES (COMBINATION METER ASSEMBLY - NO. 1 CAN JUNCTION CONNECTOR)

    1. C304159C04

      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the E12 combination meter assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E12-37 (CANH) - E12-36 (CANL)

      Cable disconnected from negative (-) battery terminal

      108 to 132 Ω

    Result

    Result

    OK

    NG
    OK

    REPLACE COMBINATION METER ASSEMBLY

    Click here

    NG

  3. CHECK FOR OPEN IN CAN BUS LINES (ECM - NO. 1 CAN JUNCTION CONNECTOR)

    1. Reconnect the E12 combination meter assembly connector.

    2. C395559C01

      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the A34 ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A34-26 (CANH) - A34-25 (CANL)

      Cable disconnected from negative (-) battery terminal

      108 to 132 Ω

    Result

    Result

    Result

    OK

    NG
    OK

    REPLACE ECM

    Click here

    NG

  4. CHECK FOR OPEN IN CAN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR (ENGINE ROOM MAIN WIRE))

    1. Reconnect the A34 ECM connector.

    2. C289288C19

      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Connector)

      *b

      to ECM

      Disconnect the A59 No. 1 CAN junction connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Connected to

      A59-1 (CANH) - A59-12 (CANL)

      Cable disconnected from negative (-) battery terminal

      108 to 132 Ω

      ECM

    Result

    Result

    Proceed to

    OK

    A

    NG (ECM main line)

    B
    B

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - NO. 1 CAN JUNCTION CONNECTOR)

    A

  5. CHECK FOR OPEN IN CAN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR (INSTRUMENT PANEL WIRE))

    1. Reconnect the A59 No. 1 CAN junction connector.

    2. C289288C20

      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Connector)

      *b

      to Combination Meter Assembly

      Disconnect the E2 No. 1 CAN junction connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Connected to

      E2-4 (CANH) - E2-15 (CANL)

      Cable disconnected from negative (-) battery terminal

      108 to 132 Ω

      Combination meter assembly

    Result

    Result

    Proceed to

    OK

    A

    NG (Combination meter assembly main line)

    B
    A

    REPLACE NO. 1 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (COMBINATION METER ASSEMBLY - NO. 1 CAN JUNCTION CONNECTOR)